JEE Main 2022ChemistrySome Basic Concepts of ChemistryMediumMCQ

JEE Main 2022 — Some Basic Concepts of Chemistry Question with Solution

JEE Main 2022 (27 Jul Shift 1)

Question

250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are H=1u; C=12 u; O=16 u)

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Show full solutionCorrect option: B
Correct answer
B2.06

Step-by-step explanation

C6H12O6→Glucose

Given: %C=10.8=mass of Cmass of solution×100

10.8×250100= mass of C⇒ Mass of C=27gm

mass of Cmass of glucose=72180mass of glucose = 27×18072

∴ mass of glucose =67.5gm

∴ moles of glucose =67.5180 = 0.375 moles

Mass of solvent =250-67.5gm=182.5gm

∴ Molality =moles of solutemass of solvent (kg) = 0.3750.1825=2.055≈2.06

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About this question

This is a previous-year question from JEE Main 2022, covering the Some Basic Concepts of Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.